Answer:
If the velocity is constant there is no friction it will equal to zero. It is Fn=Ff
Explanation:
A pilot must fly his plane due north to reach his destination. The plane can fly at 300 km/h in still air. A wind is blowing out of the northeast at 90 km/h. (a) What is the speed of the plane relative to the ground
Answer:
229.5 km/h
Explanation:
Given that
Velocity of the plane relative to the ground = V.pg = ?
Velocity of air relative to the ground = V.ag = 90 km/h
Velocity of the plane relative to air = V.pa = 300 km/h
V.pg = V.ag + V.pa
Where
V.ag = 90 km/h
= -90 cos 45i - 90 sin 45j
V.pa = 300 km/h
= 300 cos θi + 300 sin θj
V.pg = [-90 cos 45i - 90 sin 45j] + [300 cos θi + 300 sin θj], on rearranging and collecting like terms
V.pg = [300 cos θ - 90 cos 45]i + [300 sin θ - 90 sin 45]j
If vector i = 0, then
300 cos θ - 90 cos 45 = 0
300 cos θ = 90 cos 45
cos θ = 90 cos 45 / 300
cos θ = 63.6396 / 300
cos θ = 0.2121
θ = cos^-1 0.2121
θ = 77.75
We then use this θ to find vector j
V.pg = 300 sin θ - 90 sin 45
V.pg = 300 sin77.75 - 90 sin45
V.pg = 293.1693 - 63.6396
V.pg = 229.5297 km/h
An Olympian lifts a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
The force of gravity equals 9.8 m/s. What is the potential energy of the weights?
Answer:
PE = MGH. 1375 x 9.8 x 2. = 26950 joules
Explanation:
First do 1375 x 9.8 which is MG then times it by 2 which is H
Mass x Gravity x Height
the gravity will always be 9.8
I would love a brainliest
The the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
What is Potential energy?The energy of a body by virtue of its position is called potential energy. Mathematically -
E[P] = mgh
Given is an Olympian who lifted a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
We can write the given data as follows -
Mass of weights = [M] = 1375 Kg
Displacement = [h] = 2 meters
Therefore, using the formula for potential energy, we can write -
E[P] = mgh
E[P] = 1375 x 9.8 x 2
E[P] = 26950 joules
Therefore, the the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
To solve more questions on Mechanical Energy, visit the link below-
https://brainly.com/question/20719292
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The electrical resistance of a circuit is influenced by the _____, _____, and _____ of the wires.
Answer:
Length, gauge/size and composition
Explanation:
The longer the wire is the more resistance
The thinner the wire is more resistance
The difference in material effects the resistance ie. copper versus aluminium.
A truck is carrying a load of furniture and has a momentum of 33,842 kg m/s. If half of the furniture falls off the truck (mass is cut in half), what is the truck’s new momentum?
Answer:
16921
Explanation:
Usually, if and when the truck does lose part of its load, or load gets cut into half, then it's momentum gets reduced to half of the original momentum. This is because, from the definition of momentum, we understand that it's the multiplication of mass and velocity. This means that if the mass gets reduced to half, then the total momentum goes ahead to be reduced to half just as well.
New momentum = 1/2 * 33842
New momentum = 16,921 kg∙m/s.
A horse is working steadily, providing 750 W of output power. How much food energy does the horse need to work for 1 hour, to the nearest MJ
Answer:
Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.
Explanation:
Since horse is working steadily, the power experimented by the horse ([tex]\dot W[/tex]), measured in watts, is at constant rate. Then, the work needed by the horse ([tex]W[/tex]), measured in joules, is equal to that power multiplied by time ([tex]\Delta t[/tex]), measured in seconds. That is:
[tex]W = \dot W\cdot \Delta t[/tex] (1)
If we know that [tex]\dot W = 750\,W[/tex] and [tex]\Delta t = 3600\,s[/tex], then the work needed for the horse is:
[tex]W = (750\,W)\cdot (3600\,s)[/tex]
[tex]W = 2.7\times 10^{6}\,J[/tex]
[tex]W = 2.7\,MJ[/tex]
Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.
The force f is given in terms of time t and displacement X by the equation F= Asin Bx +C sin dt. What is the dimension of D/B?
Answer:
Here's what I think,
A_Trigonometric_ratio (whatever)
The general form of sin/cos/tan(angle).
So here as in the general form the "whatever" is always an "angle" input which (may sound a bit unfair but) is a dimensionless quantity.
As mentioned in your question,
F= Asin(Bt) + C cos (Dy)
Dimentions of these terms will be same (by homogenity of dimensions).
So what we gotta do here is make Bt and Dy dimensionless for this whole equation to work.
According to your question t is time,
So to make Bt dimensionless,
B must be equal to inverse of time i.e T^(-1)
Using the same process on Dy, gives inverse of length i.e L^(-1)
So,
B= M^(0)L^(0)T^(-1)
D = M^(0)L^(-1)T^(0)
The dimension of D/B then will be M^(0)L^(-1)T^(1)
When Mary talks, she creates an intensity level of 60 dB at your location. Alice talks with the same volume, also giving 60 dB at your location. If both Mary and Alice talk simultaneously from the same spot, what would be the new intensity level that you hear
Answer:
hm
Explanation:
facil
My dog Ubu can run at 21 mi/h. How far can he travel in 40 minutes?
Answer:
14
Explanation:
21miles/3=7
7*2=14
What is the maximum force that the student could apply to a 220kg object on the same surface before the box would start to slide
Answer:
Force needed to move the box is 2,158.2N
Explanation:
Step one:
We are given that the mass =220kg
The force needed to overcome friction is the same as the weight of the box
Step two :
So from
F=mg
W=mg
Substitute
W=220*9.81
W=2,158.2 N
Calculate the average (mean) of these numbers: 6, 5, 7, 9.8*
1. 35
2. 8.75
3. 5
4. 7
Answer:
13.94 to 2 d.p
Explanation:
just add them all up and i am confused the ones you said or the ones listed ?
the one i did was the listed ones
Migration is the seasonal movement of a population of organisms from one place to another True or false
Answer:
true lol its jist common sense
Answer: Seasonal migration is the movement of various species from one habitat to another during the year. Resource availability changes depending on seasonal fluctuations, which influence migration patterns. ... Many species, especially birds, migrate to warmer locations during the winter to escape poor environmental conditions.
Explanation:
Predict Phenomena A positively charged particle is placed next to an
negatively charged object. In which direction does the positively charged
particle move? Explain why.
Answer:
The positively charged particle will move towards the negatively charged particle.
Explanation:
According to Coulomb's Law, there are two types of charges--positive charge and negative charge. Coulomb said that they are either attractive or repulsive but the basic law in charges states that opposite attracts. Since they (the two charged objects) are oppositely charged, they will then move towards one another.
How much work would be needed to lift the ball from the 2-m shelf to the 5-m shelf, and how much potential energy would it have on the 5-m shelf?
Answer:
a) 2.94 N
b) 4.90 N
Explanation:
Let us assume that the weight of the ball is 0.98 N
Solution:
a) An object’s gravitational potential energy depends on two factors which are height and its weight (or mass). The equation for gravitational potential energy (PE) is given as:
Potential energy = weight (w) * height (h)
PE = wh
Potential energy at 2 m shelf = weight * height = 0.98 N * 2 m = 1.96 N
Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N
The work needed to lift the ball from the 2-m shelf to the 5-m shelf = Potential energy at 5 m shelf - Potential energy at 2 m shelf
The work needed to lift the ball from the 2-m shelf to the 5-m shelf = 4.90 N - 1.96 N = 2.94 N
b) Potential energy at 5 m shelf = weight * height = 0.98 N * 5 m = 4.90 N
Help please !
Which nucleotides form an RNA molecule?
Choose all that apply:
1) Adenine (A)
2) Uracil (U)
3) Thymine (T)
4) Cytosine (C).
Answer:
1) Adenine (A) 2. Uracil (U) 4) Cytosine (C)
Explanation:
"RNA consists of four nitrogenous bases: adenine, cytosine, uracil, and guanine."
what is one reason that john adams and benjamin franklin believed the articles of confederation should be revised.
Answer:
Explanation:
Their most intimate experience probably happened during an unsuccessful peace mission in September 1776. The British forces had recently raced across Long Island (New York) and almost destroyed the American Army. The British commander, Adm. Lord Richard Howe, then offered peace. Congress sent Adams, Franklin, and Edward Rutledge (South Carolina) to meet Howe on Staten Island.
Howe hoped to resolve the differences between what Great Britain still considered its colonies and the mother country. The Americans insisted on British recognition of independence, but Howe had no such authority, and Adams and Franklin had little of their own. Although cordial, the meeting broke up without success after just three hours.
During the mission, Adams and Franklin lodged together at crowded inn in a small room with only one window. Adams records an unforgettable and amusing story in his diary about that evening and hearing Franklin’s theory of colds.
A baseball has an approximate mass of 0.15 kg. If a bat strikes the baseball with a force of 6 N, what is the acceleration of the ball?
Answer:
a = 40 [m/s²]
Explanation:
These kinds of problems can be solved using Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = force = 6 [N]
m = mass = 0.15 [kg]
a = acceleration [m/s²]
[tex]a=F/m\\a=6/0.15\\a=40[m/s^{2} ][/tex]
Answer:
40 .............vxfhgcffffxxxhhxcjcxghxfgxsfg
Which statements compare linear and angular momentum? Check all that apply.
Both measure the tendency of objects to resist a change in motion.
Both are affected by the mass of the object in motion.
Both are affected by the distribution of mass relative to an axis.
Both involve velocity.
Both involve rotation.
Answer:
A,B,D
Explanation:
cause ik
What type(s) of charges will be free to move around independently in a conductor under typical classroom conditions
Answer:
it is electron that is free to move in conductor
A 2.5 kg tribble is placed in a bucket and whirled in a 1.4 m radius vertical circle at a constant tangential speed. If the force on the tribble from the bucket does not exceed 10 times its weight (tribbles are a hardy species), the maximum tangential speed is
Given that,
Mass of a tribble, m = 2.5 kg
Radius, r = 1.4 m
The force on the tribble from the bucket does not exceed 10 times its weight.
To find,
The maximum tangential speed.
Solution,
The force acting on the tribble is equal to the centripetal force.
F = 10mg
The formula for the centripetal force is given by :
[tex]F=\dfrac{mv^2}{r}[/tex]
v is maximum tangential speed
[tex]v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{mgr}{m}} \\\\v=\sqrt{{10gr}} \\\\v=\sqrt{10\times 9.8\times 1.4} \\\\v=11.7\ m/s[/tex]
So, the maximum tangential speed is 11.7 m/s.
single phase ac voltage of 240 v is applied to a series circuit whose impedance is 10 60 find the resistance
Complete question
Single phase ac voltage of 240 v is applied to a series circuit whose impedance is 10<60 find the resistance
Answer:
[tex]R=5 ohms[/tex]
Explanation:
From the question we are told that
Voltage[tex]V=240[/tex]
Impedance[tex]Z= 10<60[/tex]
General converting from polar to Cartesian form is given by
[tex]X=r*cos \theta[/tex]
[tex]Y = r * sin\theta[/tex]
Therefore
[tex]X=10 cos 60\texdegree[/tex]
[tex]X=5[/tex]
[tex]Y = 10 sin 60\textdegree[/tex]
[tex]Y = 8.660[/tex]
Therefore
[tex]Z=5+j8.660[/tex]
Generally the equation impedance is mathematically given as
[tex]Z=R+jX[/tex]
where
R is Resistance
X is Reactance
Therefore
[tex]R=5 ohms[/tex]
54:29
Mason notices that his boat sinks lower into the water in a freshwater lake than in the ocean. What could explain
this?
The boat is more dense in salt water.
The boat is less dense in salt water.
Salt water is less dense than freshwater
O Salt water is more dense than freshwater
Save and Exit
Sube
Mark this and retum
Answer:
Salt water is more dense than freshwater
Explanation:
The only and best explanation for this phenomenon for this occurrence is that salt water is more dense than freshwater.
Density is the mass per unit volume of a substance. When a substance is A more dense than the other substance B, B will float on A. So, the density of the salt water is higher than that of the fresh water because it has more particles per unit volume compared to fresh water. Therefore, the boat will go farther into the fresh water compared to the salt water.A birthmark is generally a:
macule.
excoriation.
pustule.
bullae.
Answer:
macule
Explanation:
its aa flat round areausually distingurished from its surroundung skin by its changed in color. smaller than 1cm am small hemorrhage spot.
A material that restricts the flow of electricity or thermal energy is a what
Answer: Insulator
Explanation:
An insulator is a material that restricts the flow of electricity or thermal energy.
Answer:
plastic or wood
Explanation:
If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity in km/h for the entire trip
Answer:
speed v = 0.148 m / s
velocity v = 0
Explanation:
In this exercise we must be careful that the speed is a scalar and the speed is a vector, let's start by looking for the speed
v = Δx /Δt
the distance traveled is x = 2d and the time taken is
t = 7h 30 min
let's reduce to seconds
t = 7 h 3600s / 1h + 30 min 60s / 1min = 27000 s
so the speed is
v = 2d / 27000
to finish the calculation suppose a distance traveled d = 2000 m
v = 2 2000/27000
v = 0.148 m / s
this is the raides which is the speed module
Velocity is a vector,
v = Dx / Dt
in this case the displacement is
Dx = d -d
Dx = 0
the total displacement is zero since it returns to the starting point, consequently the velocity is zero
v = 0
bold is a vector
How much heat Q2Q2 is transferred to the skin by 25.0 gg of steam onto the skin? The heat of vaporization for steam is L=2.256×106J/kgL=2.256×106J/kg.
Answer:
56400Joules
Explanation:
The quantity of heat required is expressed as;
Q = mL
m is the mass = 25g = 0.025kg
L is the latent heat of vaporization for steam = 2.256×10^6J/kg
Substitute into the formula as shown;
Q = 0.025×2.256×10^6
Q = 56400Joules
Hence the quantity of hear required is 56400Joules
The amount of heat transfer from the steam is of 56400 J.
Given data:
The mass of steam is, m = 25.0 g = 0.025 kg.
The latent heat of vaporization of steam is, [tex]L = 2.256 \times 10^{6} \;\rm J/kg[/tex].
When heat is to be given to a unit mass of substance to converts it from a liquid phase to vapor phase. Then it is known as Latent heat of vaporization. The amount of heat is expressed as,
[tex]Q = m \times L[/tex]
Solving as,
[tex]Q = 0.025 \times (2.256 \times 10^{6})\\\\Q = 56400 \;\rm J[/tex]
Thus, we can conclude that the amount of heat transfer from the steam is of 56400 J.
Learn more about the Latent heat of vaporization here:
https://brainly.com/question/24203857
A record rotates on a turntable at 33 rpm. You may want to review What is the angular speed in rad/s?
Answer:
the angular speed in rad/s is 3.45
Explanation:
The computation of the angular speed in rad/s is as follows:
As we know that
1 rpm means 1 revolution per minute
Also 1 minute = 60 seconds
SO, for 33 rpm, the angular speed is
= 33 ÷ 60 × 2π
= 3.45 rad/s
As the revolution is of 360 degrees i.e. equivalent to 2π
Hence, the angular speed in rad/s is 3.45
An object accelerates downward at a constant rate of 2.00 m/s2 while completely submerged in water. Neglect the viscosity (fluid friction) of the water. The average density of the object is ______ kg/m3. Use g
Answer:
833kg/m³
Explanation:
We have volume as Vm³
Density of this object = dKg/m³
Water density = 1000kg/m³
g = 10m/s²
We calculate FB which is the the buoyant force on object. Calculated as volume of object multiplied by water density
Fb = 1000Vg upwards
W = Vdg
Acceleration = net upwards/m
M = mass
2 = (1000g-gd)/d
2d = 10000 - 10d
2d + 10d = 10000
12d = 10000
d = 833.33kg/m³
Approximately 833kg/m³
The average density of the object is therefore 833kg/m³
a proton travelling along is x-axis is slowed by a uniform electric field E. at x = 20.0 cm, the proton has a speed of 3.5x10^6 m/s and at 80.0 cm the speed is zero. Determine the magnitude and direction of e,
Answer:
[tex]E=101955.8volt/m[/tex]
The electric field direction is toward the right
Explanation:
From the question we are told that
Initial X-co-ordinate of proton [tex]X_1=20.0cm => \frac{20}{100}m[/tex]
Initial speed of Proton [tex]V_1= 3.5*10^6 m/s[/tex]
Final X-co-ordinate of proton [tex]X_2=80.0cm => \frac{80.0}{100}m[/tex]
Final speed of Proton [tex]V_2=0[/tex]
Generally the mass of Proton is given by
[tex]m_P=1.67*10^-27[/tex]
Generally the kinetic energy of the proton is mathematically given by
[tex]K.E_p=1/2mv^2[/tex]
[tex]K.E_p=1/2*1.6*10^-^2^7*(3.5*10^6)^2[/tex]
[tex]K.E_p=9.8*10^-^1^5[/tex]
Generally the change in electric potential [tex]\triangle V[/tex] is mathematically given by
[tex]\triangle V =\frac{K.E_p}{q}[/tex]
Charge on a proton [tex]q=1.602*10^-^1^9[/tex]
[tex]\triangle V =\frac{9.8*10^-^1^5}{1.602*10^-^1^9}[/tex]
[tex]\triangle V =61173.5volts[/tex]
Generally the equation for magnitude of an electric field is mathematically given by
[tex]E=\frac{\triangle V}{\triangle d}[/tex]
Where
[tex]d=0.8m-0.2m\\d=0.6m[/tex]
Therefore
[tex]E=\frac{61173.5}{0.8-0.2}[/tex]
[tex]E=\frac{61173.5}{0.6}[/tex]
[tex]E=101955.8volt/m[/tex]
The direction of the charge is towards the right
Helppp plssss I am needing help for science and there is a photo pls answer
Answer:
sorry I don't really know :P
Explanation:
Answer:
how many of those questions do you need answers to?
Explanation:
what does it mean to say that mass is conserved during a physical change?
Answer:
Explanation:
When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.
( sample response )